EP0152113A1 - Appareil diagnostic à ultrasons - Google Patents

Appareil diagnostic à ultrasons Download PDF

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Publication number
EP0152113A1
EP0152113A1 EP85101628A EP85101628A EP0152113A1 EP 0152113 A1 EP0152113 A1 EP 0152113A1 EP 85101628 A EP85101628 A EP 85101628A EP 85101628 A EP85101628 A EP 85101628A EP 0152113 A1 EP0152113 A1 EP 0152113A1
Authority
EP
European Patent Office
Prior art keywords
signal
kernel
ultrasonic wave
ultrasonic
depth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP85101628A
Other languages
German (de)
English (en)
Other versions
EP0152113B1 (fr
Inventor
Yutaka Toshiba-Shinkoyasu-Ryo 528 Matsui
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
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Toshiba Corp
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Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Publication of EP0152113A1 publication Critical patent/EP0152113A1/fr
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Publication of EP0152113B1 publication Critical patent/EP0152113B1/fr
Expired legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H5/00—Measuring propagation velocity of ultrasonic, sonic or infrasonic waves, e.g. of pressure waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications
    • G01S15/89—Sonar systems specially adapted for specific applications for mapping or imaging
    • G01S15/8906—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques
    • G01S15/8977—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques using special techniques for image reconstruction, e.g. FFT, geometrical transformations, spatial deconvolution, time deconvolution
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
    • G01S7/52023—Details of receivers
    • G01S7/52036—Details of receivers using analysis of echo signal for target characterisation

Definitions

  • tissue characterization which is aimed at the quantification of tissue characteristics according to the variations of physical quantities which are sustained by an ultrasonic wave when it propagates through tissues of a living body.
  • velocity has been chosen as a representative physical quantity of ultrasonic waves, and measurements have been made by means of the prior art measuring method which utilizes the transmitted wave.
  • An object of the present invention is to provide an ultrasonic diagnostic equipment which permits to determine the average velocity of the ultrasonic wave by the ultrasonic pulse reflection method.
  • Another object of the present invention is to provide an ultrasonic diagnostic equipment which permits to measure the velocity of the ultrasonic wave by utilizing the technique of the synthetic aperture method.
  • the ultrasonic diagnostic equipment in accordance with the present invention includes an ultrasonic transducer which driven by a pulser so-as to transmit an ultrasonic wave and receive the reflected ultrasonic wave from an object, a phase detector which obtains hologram signal for the object by detecting the phase shift of the signals received by the ultrasonic transducer, a signal generator which generates reference signals required for synthetic aperture processing that uses the depth of the object as the parameter, and an operational unit which determines the reconstructed data for the object by carrying out synthetic aperture method by the use of the kernel signal and the hologram signal.
  • the ultrasonic diagnostic equipment is equipped with a control unit which controls the operational unit and the signal generator so as to detect the maximum value of the amplitude of the reconstructed data obtained by varying the kernel signal for the hologram signal, a comparator which compares the maximum values of the amplitude, and a sound velocity computing unit which computes the velocity of the ultrasonic wave from the result of the comparison.
  • Fig.l there is shown the scanning principle used in the synthetic aperture method.
  • an ultrasonic transducer 10 which is moved and scanned in the x-axis direction, transmits ultrasonic pulses in the z-axis direction toward an object 12, and receives the wave reflected by the object 12. If the coordinates of the point for transmission and reception of the ultrasonic pulses by the ultrasonic transducer 10 are (x, o), and the coordinates of the location of the object which is assumed to be a point reflector are (o, z), then the reflected wave received by the ultrasonic transducer 10, namely, the received signal, S is given by the following equation.
  • f(t) represents the envelope of the ultrasonic pulse
  • tn is given by where V is the velocity of the ultrasonic wave.
  • V is the velocity of the ultrasonic wave.
  • W o is given by in terms of the center frequency f 0 of the ultrasonic wave.
  • each of the corresponding phase shift of the received signals is detected, and the high frequency component is removed by passing them through low-pass filters, to obtain mutually orthogonal signals S R and S I that form the hologram 5 components.
  • the hologram signal S 0 for the reflector is given by
  • the calculation of the reconstructed image A for the point reflector by means of the aperture synthesis method is accomplished by convolving the kernel signal S c given by
  • the kernel signal given in the above is the kernel for the convolution operation.
  • W 1 is given by in terms of the fundamental frequency f 1 of the kernel signal. Therefore, with interval of integration , the reconstructed image A is shown as follows.
  • the present computation will be carried out using the hologram data uncorrected for the range coverture compensation because of the time for processing becomes too long and the hardware constitution becomes too complicated in use of the former hologram data.
  • the reconstructed image is deteriorated by the amount due to the velocity deviation ⁇ V.
  • the present invention has been proposed in consideration of this situation, which is to estimate the velocity of the ultrasonic wave based on the degree of deterioration of the reconstructed image.
  • the denominator of the exponent in the exponential function for the kernel signal of Eg.(6) may be rewritten as where z' is given by As shown by Eq. (7), when the velocity of the ultrasonic wave is shifted by an amount AV, the deterioration of the reconstructed image will disappear if the kernel signal for the depth z is replaced by the kernel signal for the depth z'.
  • the depth z' is determined as the depth on which the reconstructed image without deterioration, or the largest of the maximum amplitude, is obtained, and A V is then found from Eq.(9), which in turn makes it possible to determine the velocity of the ultrasonic wave under the situation
  • the ultrasonic diagnostic equipment embodying the present invention includes an ultrasonic transducer 20 which, is energized by a pulser 22 to, transmit an ultrasonic pulse with certain spread, and receive the reflected wave of the ultrasonic pulse from a reflector.
  • the reflected signal is amplified to a required level via a receiver.
  • Phase detectors 24 and 26 detect the phase shifts of the received signal by accepting each of the two signals with phase difference of 90° which consist of a sine wave signal supplied by an oscillator 28 and another sine wave signal that is obtained by shifting the phase of the wave from the oscillator 28 by 90° through a phase shifter 30.
  • the sine wave signals are set to have a frequency which is equal to the resonance frequency of the ultrasonic transducer 20, and the high frequency components of the signals whose phase shifts are detected have been removed by the low-pass filter which is fuilt in the detector when they are output.
  • a cosine hologram signal and a sine hologram signal which are mutually orthogonal. After they are each digitized via the A/ D converters 32 and 34 they are stored in memories 36 and 38.
  • a memory 40 memorizes a plurality of kernel signals corresponding to the various values of the depth 2 as a parameter.
  • An operation processing unit 42 a microprocessor carries out the operational process for synthetic aperture indicated by Eq.(6) based on the information coming from the memories 36, 38, and 40, and displays the reconstructed image A thus obtained on an indicator 44. At the sametime, the operation processing unit 42 detects the maximum value of the amplitude, and transfers the data to a peak detector 46.
  • a control unit 48 is adapted for supplying the peak detector 46 with the variations in the maximum value of the recorded image which are obtained by feeding the kernel signal to the operation processing unit 42 in succession, and controls a series of actions of the various parts involved in this operation.
  • the peak detector 46 there carry out the detection of the largest maximum value in the amplitude of the reconstructed image obtained by varying the depth of the kernel signal, and the corresponding depth z' of the kernel signal is transferred to a sound valocity computer 50.
  • the sound velocity computer 50 At the sound velocity computer 50, the velocity of the ultrasonic wave is computed by the use of Eq. (8), and the result is displayed.
  • the computation of the velocity of the ultrasonic wave according to the present device is easy, and the method is very effective.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Acoustics & Sound (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
EP85101628A 1984-02-16 1985-02-14 Appareil diagnostic à ultrasons Expired EP0152113B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP25983/84 1984-02-16
JP59025983A JPS60171037A (ja) 1984-02-16 1984-02-16 超音波診断装置

Publications (2)

Publication Number Publication Date
EP0152113A1 true EP0152113A1 (fr) 1985-08-21
EP0152113B1 EP0152113B1 (fr) 1989-06-07

Family

ID=12180949

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85101628A Expired EP0152113B1 (fr) 1984-02-16 1985-02-14 Appareil diagnostic à ultrasons

Country Status (5)

Country Link
US (1) US4633883A (fr)
EP (1) EP0152113B1 (fr)
JP (1) JPS60171037A (fr)
CA (1) CA1226663A (fr)
DE (1) DE3570929D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0226466A3 (en) * 1985-12-13 1987-10-14 Matsushita Electric Industrial Co., Ltd. Ultrasonic diagnostic apparatus based on variations of acoustic characteristic

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3865034D1 (de) * 1987-02-09 1991-10-31 Matsushita Electric Industrial Co Ltd Ultraschall-untersuchungsgeraet.
US4852577A (en) * 1988-04-07 1989-08-01 The United States Of America As Represented By The Department Of Health And Human Services High speed adaptive ultrasonic phased array imaging system
US5201715A (en) * 1991-11-19 1993-04-13 Mcghan Medical Corporation Implantable devices having ultrasonic echographic signature
US5283672A (en) * 1992-05-04 1994-02-01 Rockwell International Corporation Holographic techniques for generating high resolution telescopic images
US5331964A (en) * 1993-05-14 1994-07-26 Duke University Ultrasonic phased array imaging system with high speed adaptive processing using selected elements
US6208181B1 (en) * 1998-01-14 2001-03-27 Intel Corporation Self-compensating phase detector
US6014897A (en) * 1998-09-02 2000-01-18 Mo; Larry Y. L. Method and apparatus for improving sidelobe performance of sparse array using harmonic imaging
KR100875203B1 (ko) * 2005-12-28 2008-12-19 주식회사 메디슨 초음파 영상의 획득 방법
CN106725610B (zh) * 2016-11-29 2019-08-06 深圳大学 基于移动声束相干激励剪切波的弹性测量方法及系统

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885224A (en) * 1972-02-24 1975-05-20 Carl N Klahr Signal processing apparatus for imaging scanner
EP0110621A2 (fr) * 1982-11-20 1984-06-13 Kabushiki Kaisha Toshiba Système de traitement de signaux d'image basé sur la technique d'ouverture synthétique

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4170142A (en) * 1977-07-15 1979-10-09 Electric Power Research Institute, Inc. Linear transducer array and method for both pulse-echo and holographic acoustic imaging
US4531411A (en) * 1983-10-25 1985-07-30 The United States Of America As Represented By The United States Department Of Energy Acoustic emission linear pulse holography

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885224A (en) * 1972-02-24 1975-05-20 Carl N Klahr Signal processing apparatus for imaging scanner
EP0110621A2 (fr) * 1982-11-20 1984-06-13 Kabushiki Kaisha Toshiba Système de traitement de signaux d'image basé sur la technique d'ouverture synthétique

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
ACOUSTICAL IMAGING, London, 19th-22nd July 1982, vol. 12, pages 479-491, edited by E.A. Ash and C.R. Hill, Plenum Press, New York, US; P.R. MESDAG et al.: "An approach to tissue characterization based on wave theory using a new velocity analysis technique" *
IEEE TRANSACTIONS ON SONICS AND ULTRASONICS, vol. SU-27, no. 5, September 1980, pages 249-252, New York, US; E.E. HUNDT et al.: "Digital processing of ultrasonic data by deconvolution" *
PATENTS ABSTRACTS OF JAPAN, vol. 8, no. 211 (P-303)[1648], 26th September 1984; & JP - A - 59 94091 (TOSHIBA K.K.) 30-05-1984 *
ULTRASONICS, vol. 11, no. 5, September 1973, pages 223-226, Guildford, GB; J. JELLINS et al.: "Velocity compensation in water-coupled breast echography" *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0226466A3 (en) * 1985-12-13 1987-10-14 Matsushita Electric Industrial Co., Ltd. Ultrasonic diagnostic apparatus based on variations of acoustic characteristic
US4817615A (en) * 1985-12-13 1989-04-04 Matsushita Electric Industrial Co., Ltd. Ultrasonic temperature measurement apparatus
EP0406915A1 (fr) * 1985-12-13 1991-01-09 Matsushita Electric Industrial Co., Ltd. Appareil diagnostique à ultrasons se basant sur les variations d'une caractéristique acoustique

Also Published As

Publication number Publication date
JPS60171037A (ja) 1985-09-04
US4633883A (en) 1987-01-06
DE3570929D1 (en) 1989-07-13
CA1226663A (fr) 1987-09-08
EP0152113B1 (fr) 1989-06-07

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